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<pre class="textdiagram" id="fig20">
+---------+   +---------+   +---------+
|         |   |         |   |         |
| Client  |   | Client  |   | Client  |
|         |   |         |   |         |
+---------+   +---------+   +---------+
|   REQ   |   |   REQ   |   |   REQ   |
\---------/   \---------/   \---------/
  connect       connect       connect
     |             |             |
     |             |             |
  request       request       request
     |             |             |
     +-------------+-------------+
                   |
             fair-queuing
                   |
                   v
                 bind
             /-----------\
             |  ROUTER   |
             +-----------+
             |           |
             |   Broker  |
             |           |
             +-----------+
             |  DEALER   |
             \-----------/
                 bind
                   |
            load balancing
                   |
     +-------------+-------------+
     |             |             |
  request       request       request
     |             |             |
     v             v             v
  connect       connect       connect
/---------\   /---------\   /---------\
|   REP   |   |   REP   |   |   REP   |
+---------+   +---------+   +---------+
|         |   |         |   |         |
| Service |   | Service |   | Service |
|    A    |   |    B    |   |    C    |
|         |   |         |   |         |
+---------+   +---------+   +---------+
</pre>
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